This document provides a sample configuration for tunneling an IPv6 Routing Information Protocol (RIP), and an IPv6 Border Gateway Protocol (BGP) network and traffic through a pre-existing IPv4 network. This technique allows you to connect IPv6 sites over the IPv4 backbone that exists.
A correlation by itself is often not very informative. A large correlation does not necessarily indicate causality. If one or both of the variables involved in the correlation are related to some third variable, the correlation may change substantially when controlling for that third variable. In this case, the SAT I (aptitude) score is highly correlated with high school GPA and with subject achievement test scores on the SAT II.
Definition and calculation [edit]. The Spearman correlation coefficient is defined as the Pearson correlation coefficient between the ranked variables. For a sample of size n, the n raw scores are converted to ranks, and Ï is computed from: where, is the difference between ranks.See the example below.pearman's coefficient, like any correlation calculation, is appropriate for both continuous and discrete variables, including ordinal variables. Spearman's and Kendall's can be formulated as special cases of a more general correlation coefficient.